Have you narrowed down what may be causing the problem on your site – usually a conflict with another plugin or your theme?
I have tried to deactivate all plugins, and when I re-activate only the calendar, it produces the same error (i.e. it’s not a plugin vs other plugin incompatibility)
If I switch back to the original standard theme, or any of the other “recommended” themes, it behaves in exactly the same way, so the error seems to run deeper than just a conflict against a specific theme.
Some developers may be able to work with you to get this type of problem solved, others not so much due to time or other reasons.
I can try to contact the author(s) of the calendar plugin and see if they can help.
